Spray a 10" x 10" pan with nonstick baking spray. Place strips of parchment paper in bottom of pan so the parchment extends over the four pan sides. (note: a 9" x 13" pan may also be used)
In a medium bowl, whisk together flour, ginger, cinnamon, baking soda and salt. Set aside.
Using a stand mixer with the paddle attachment, begin mixing butter and granulated sugar until light and fluffy (2 - 4 minutes on medium speed). Scrape the bowl as needed. Note: a hand mixer may also be used.
Add the egg and molasses to the mixing bowl. Mix on medium speed until incorporated. Scrape the bowl as needed. Scrape down sides of bowl as needed.
Add the flour mixture and mix on low speed until combined.
Pour the dough into the bottom of the prepared pan. Using your hands, lightly press the dough down so it evenly covers the bottom of the pan.
Bake for 15 minutes. Note: crust will be partially baked - it will finish baking after the Pumpkin Cheesecake topping is added to the pan.
Let crust cool before starting the Pumpkin Cheesecake topping.
Make Pumpkin Cheesecake Topping
Place cream cheese in the bowl of a stand mixer fitted with the paddle attachment. Run mixer on medium speed for one minute. Scrape down the sides of the bowl and mix on medium speed for another minute. Continue to mix until no lumps remain. Note: a hand mixer may also be used.
Add granulated sugar and mix on medium speed for 2 minutes.
Add eggs and egg yolk one at a time. Mix between each addition and scrape down sides of bowl as needed.
Add pumpkin puree and spices. Mix until well combined, scraping sides of bowl as needed.
Pour Pumpkin Cheesecake topping over the partially cooked ginger cookie crust. Spread mixture evenly.
Bake and Unmold
Bake for 30 - 35 minutes at 350℉. The cheesecake portion will be a little jiggly but it will set up when it cools.
Cool at room temperature for one hour. Place in refrigerator for 2 hours to finish setting.
Unmold by pulling up on sides of parchment paper. Transfer to a cutting board. Remove parchment from bottom of the bar. Cut into desired sizes.